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net/ipv6: Do not allow route add with a device that is down

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IPv6 allows routes to be installed when the device is not up (admin up).
Worse, it does not mark it as LINKDOWN. IPv4 does not allow it and really
there is no reason for IPv6 to allow it, so check the flags and deny if
device is admin down.

Signed-off-by: David Ahern <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Reviewed-by: Roopa Prabhu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David Ahern 2018-01-24 19:45:29 -08:00 • committed by David S. Miller
commit 955ec4cb3b
1 changed files with 6 additions and 0 deletions
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6
net/ipv6/route.c
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@ -2734,6 +2734,12 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
if (!dev)
goto out;
if (!(dev->flags & IFF_UP)) {
NL_SET_ERR_MSG(extack, "Nexthop device is not up");
err = -ENETDOWN;
goto out;
}
if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
NL_SET_ERR_MSG(extack, "Invalid source address");